Five Pull-Ups Too Much? FitStar Knows When to Push

Living in an era of phones that monitor our location and watches that record our pulse can make us feel like we're swept along in an information tsunami. Technology should give us more control of our lives, not less.

The gym is one place where data really has the potential to work on our behalf and a new app called FitStar exemplifies where that technology is heading. The hard part about exercise is all the failure. Who wants to be...